Journal
APPLIED PHYSICS LETTERS
Volume 103, Issue 13, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4822427
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Funding
- Interconnect Focus Center (IFC)
- Materials Structures and Devices (MSD) focus center
- MARCO program of SRC
- State of New York, NSF PetaApps [OCI-0749140]
- State of New York
- National Science Foundation
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In general, there are two major factors affecting bandgaps in nanostructures: (i) the enhanced electron-electron interactions due to confinement and (ii) the modified self-energy of electrons due to the dielectric screening. While recent theoretical studies on graphene nanoribbons (GNRs) report on the first effect, the effect of dielectric screening from the surrounding materials such as substrates has not been thoroughly investigated. Using large-scale electronic structure calculations based on the GW approach, we show that when GNRs are deposited on substrates, bandgaps get strongly suppressed (by as much as 1 eV) even though the GNR-substrate interaction is weak. (C) 2013 AIP Publishing LLC.
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